Well, the Hijri date 1 Dhul Qidah 1255 corresponds to the Gregorian date Sunday, 5 January 1840. This date lies in the eleventh month of the Hijri year 1255 AH, which is Dhu Al-Qidah of 1255 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1255/11/01 is calculated using the Umm Al-Qura calendar and the sighting of the moon. One thing to remember is that this Arabic date may occur on different Gregorian date depending upon the region and country and obviously the moon.
If you are still not sure about the date then you can use our Arabic date converter.
The following is the conversion of the Gregorian date 5 January 1840 to its equivalent Arabic date.
The following is the conversion of the Arabic date 1 Dhul Qidah 1255 AH to its equivalent Gregorian date.
۞ وَٱتْلُ عَلَيْهِمْ نَبَأَ ٱبْنَىْ ءَادَمَ بِٱلْحَقِّ إِذْ قَرَّبَا قُرْبَانًۭا فَتُقُبِّلَ مِنْ أَحَدِهِمَا وَلَمْ يُتَقَبَّلْ مِنَ ٱلْءَاخَرِ قَالَ لَأَقْتُلَنَّكَ ۖ قَالَ إِنَّمَا يَتَقَبَّلُ ٱللَّهُ مِنَ ٱلْمُتَّقِينَ
But recite unto them with truth the tale of the two sons of Adam, how they offered each a sacrifice, and it was accepted from the one of them and it was not accepted from the other. (The one) said: I will surely kill thee. (The other) answered: Allah accepteth only from those who ward off (evil).
Surah Al-Maaida(5:27)